libavformat/smacker.c

   1 /*
   2  * Smacker demuxer
   3  * Copyright (c) 2006 Konstantin Shishkov
   4  *
   5  * This file is part of FFmpeg.
   6  *
   7  * FFmpeg is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU Lesser General Public
   9  * License as published by the Free Software Foundation; either
  10  * version 2.1 of the License, or (at your option) any later version.
  11  *
  12  * FFmpeg is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * Lesser General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Lesser General Public
  18  * License along with FFmpeg; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  20  */
  21
  22 /*
  23  * Based on http://wiki.multimedia.cx/index.php?title=Smacker
  24  */
  25
  26 #include <inttypes.h>
  27
  28 #include "libavutil/bswap.h"
  29 #include "libavutil/channel_layout.h"
  30 #include "libavutil/intreadwrite.h"
  31 #include "avformat.h"
  32 #include "internal.h"
  33
  34 #define SMACKER_PAL 0x01
  35 #define SMACKER_FLAG_RING_FRAME 0x01
  36
  37 enum SAudFlags {
  38     SMK_AUD_PACKED  = 0x80,
  39     SMK_AUD_16BITS  = 0x20,
  40     SMK_AUD_STEREO  = 0x10,
  41     SMK_AUD_BINKAUD = 0x08,
  42     SMK_AUD_USEDCT  = 0x04
  43 };
  44
  45 typedef struct SmackerContext {
  46     /* Smacker file header */
  47     uint32_t magic;
  48     uint32_t width, height;
  49     uint32_t frames;
  50     int      pts_inc;
  51     uint32_t flags;
  52     uint32_t audio[7];
  53     uint32_t treesize;
  54     uint32_t mmap_size, mclr_size, full_size, type_size;
  55     uint8_t  aflags[7];
  56     uint32_t rates[7];
  57     uint32_t pad;
  58     /* frame info */
  59     uint32_t *frm_size;
  60     uint8_t  *frm_flags;
  61     /* internal variables */
  62     int cur_frame;
  63     int is_ver4;
  64     int64_t cur_pts;
  65     /* current frame for demuxing */
  66     uint8_t pal[768];
  67     int indexes[7];
  68     int videoindex;
  69     uint8_t *bufs[7];
  70     int buf_sizes[7];
  71     int stream_id[7];
  72     int curstream;
  73     int64_t nextpos;
  74     int64_t aud_pts[7];
  75 } SmackerContext;
  76
  77 typedef struct SmackerFrame {
  78     int64_t pts;
  79     int stream;
  80 } SmackerFrame;
  81
  82 /* palette used in Smacker */
  83 static const uint8_t smk_pal[64] = {
  84     0x00, 0x04, 0x08, 0x0C, 0x10, 0x14, 0x18, 0x1C,
  85     0x20, 0x24, 0x28, 0x2C, 0x30, 0x34, 0x38, 0x3C,
  86     0x41, 0x45, 0x49, 0x4D, 0x51, 0x55, 0x59, 0x5D,
  87     0x61, 0x65, 0x69, 0x6D, 0x71, 0x75, 0x79, 0x7D,
  88     0x82, 0x86, 0x8A, 0x8E, 0x92, 0x96, 0x9A, 0x9E,
  89     0xA2, 0xA6, 0xAA, 0xAE, 0xB2, 0xB6, 0xBA, 0xBE,
  90     0xC3, 0xC7, 0xCB, 0xCF, 0xD3, 0xD7, 0xDB, 0xDF,
  91     0xE3, 0xE7, 0xEB, 0xEF, 0xF3, 0xF7, 0xFB, 0xFF
  92 };
  93
  94
  95 static int smacker_probe(AVProbeData *p)
  96 {
  97     if (   AV_RL32(p->buf) != MKTAG('S', 'M', 'K', '2')
  98         && AV_RL32(p->buf) != MKTAG('S', 'M', 'K', '4'))
  99         return 0;
 100
 101     if (AV_RL32(p->buf+4) > 32768U || AV_RL32(p->buf+8) > 32768U)
 102         return AVPROBE_SCORE_MAX/4;
 103
 104     return AVPROBE_SCORE_MAX;
 105 }
 106
 107 static int smacker_read_header(AVFormatContext *s)
 108 {
 109     AVIOContext *pb = s->pb;
 110     SmackerContext *smk = s->priv_data;
 111     AVStream *st, *ast[7];
 112     int i, ret;
 113     int tbase;
 114
 115     /* read and check header */
 116     smk->magic = avio_rl32(pb);
 117     if (smk->magic != MKTAG('S', 'M', 'K', '2') && smk->magic != MKTAG('S', 'M', 'K', '4'))
 118         return AVERROR_INVALIDDATA;
 119     smk->width = avio_rl32(pb);
 120     smk->height = avio_rl32(pb);
 121     smk->frames = avio_rl32(pb);
 122     smk->pts_inc = (int32_t)avio_rl32(pb);
 123     if (smk->pts_inc > INT_MAX / 100) {
 124         av_log(s, AV_LOG_ERROR, "pts_inc %d is too large\n", smk->pts_inc);
 125         return AVERROR_INVALIDDATA;
 126     }
 127
 128     smk->flags = avio_rl32(pb);
 129     if(smk->flags & SMACKER_FLAG_RING_FRAME)
 130         smk->frames++;
 131     for(i = 0; i < 7; i++)
 132         smk->audio[i] = avio_rl32(pb);
 133     smk->treesize = avio_rl32(pb);
 134
 135     if(smk->treesize >= UINT_MAX/4){ // smk->treesize + 16 must not overflow (this check is probably redundant)
 136         av_log(s, AV_LOG_ERROR, "treesize too large\n");
 137         return AVERROR_INVALIDDATA;
 138     }
 139
 140 //FIXME remove extradata "rebuilding"
 141     smk->mmap_size = avio_rl32(pb);
 142     smk->mclr_size = avio_rl32(pb);
 143     smk->full_size = avio_rl32(pb);
 144     smk->type_size = avio_rl32(pb);
 145     for(i = 0; i < 7; i++) {
 146         smk->rates[i]  = avio_rl24(pb);
 147         smk->aflags[i] = avio_r8(pb);
 148     }
 149     smk->pad = avio_rl32(pb);
 150     /* setup data */
 151     if(smk->frames > 0xFFFFFF) {
 152         av_log(s, AV_LOG_ERROR, "Too many frames: %"PRIu32"\n", smk->frames);
 153         return AVERROR_INVALIDDATA;
 154     }
 155     smk->frm_size = av_malloc_array(smk->frames, sizeof(*smk->frm_size));
 156     smk->frm_flags = av_malloc(smk->frames);
 157     if (!smk->frm_size || !smk->frm_flags) {
 158         av_freep(&smk->frm_size);
 159         av_freep(&smk->frm_flags);
 160         return AVERROR(ENOMEM);
 161     }
 162
 163     smk->is_ver4 = (smk->magic != MKTAG('S', 'M', 'K', '2'));
 164
 165     /* read frame info */
 166     for(i = 0; i < smk->frames; i++) {
 167         smk->frm_size[i] = avio_rl32(pb);
 168     }
 169     for(i = 0; i < smk->frames; i++) {
 170         smk->frm_flags[i] = avio_r8(pb);
 171     }
 172
 173     /* init video codec */
 174     st = avformat_new_stream(s, NULL);
 175     if (!st)
 176         return AVERROR(ENOMEM);
 177     smk->videoindex = st->index;
 178     st->codecpar->width = smk->width;
 179     st->codecpar->height = smk->height;
 180     st->codecpar->format = AV_PIX_FMT_PAL8;
 181     st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
 182     st->codecpar->codec_id = AV_CODEC_ID_SMACKVIDEO;
 183     st->codecpar->codec_tag = smk->magic;
 184     /* Smacker uses 100000 as internal timebase */
 185     if(smk->pts_inc < 0)
 186         smk->pts_inc = -smk->pts_inc;
 187     else
 188         smk->pts_inc *= 100;
 189     tbase = 100000;
 190     av_reduce(&tbase, &smk->pts_inc, tbase, smk->pts_inc, (1UL<<31)-1);
 191     avpriv_set_pts_info(st, 33, smk->pts_inc, tbase);
 192     st->duration = smk->frames;
 193     /* handle possible audio streams */
 194     for(i = 0; i < 7; i++) {
 195         smk->indexes[i] = -1;
 196         if (smk->rates[i]) {
 197             ast[i] = avformat_new_stream(s, NULL);
 198             if (!ast[i])
 199                 return AVERROR(ENOMEM);
 200             smk->indexes[i] = ast[i]->index;
 201             ast[i]->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
 202             if (smk->aflags[i] & SMK_AUD_BINKAUD) {
 203                 ast[i]->codecpar->codec_id = AV_CODEC_ID_BINKAUDIO_RDFT;
 204             } else if (smk->aflags[i] & SMK_AUD_USEDCT) {
 205                 ast[i]->codecpar->codec_id = AV_CODEC_ID_BINKAUDIO_DCT;
 206             } else if (smk->aflags[i] & SMK_AUD_PACKED){
 207                 ast[i]->codecpar->codec_id = AV_CODEC_ID_SMACKAUDIO;
 208                 ast[i]->codecpar->codec_tag = MKTAG('S', 'M', 'K', 'A');
 209             } else {
 210                 ast[i]->codecpar->codec_id = AV_CODEC_ID_PCM_U8;
 211             }
 212             if (smk->aflags[i] & SMK_AUD_STEREO) {
 213                 ast[i]->codecpar->channels       = 2;
 214                 ast[i]->codecpar->channel_layout = AV_CH_LAYOUT_STEREO;
 215             } else {
 216                 ast[i]->codecpar->channels       = 1;
 217                 ast[i]->codecpar->channel_layout = AV_CH_LAYOUT_MONO;
 218             }
 219             ast[i]->codecpar->sample_rate = smk->rates[i];
 220             ast[i]->codecpar->bits_per_coded_sample = (smk->aflags[i] & SMK_AUD_16BITS) ? 16 : 8;
 221             if(ast[i]->codecpar->bits_per_coded_sample == 16 && ast[i]->codecpar->codec_id == AV_CODEC_ID_PCM_U8)
 222                 ast[i]->codecpar->codec_id = AV_CODEC_ID_PCM_S16LE;
 223             avpriv_set_pts_info(ast[i], 64, 1, ast[i]->codecpar->sample_rate
 224                     * ast[i]->codecpar->channels * ast[i]->codecpar->bits_per_coded_sample / 8);
 225         }
 226     }
 227
 228
 229     /* load trees to extradata, they will be unpacked by decoder */
 230     if(ff_alloc_extradata(st->codecpar, smk->treesize + 16)){
 231         av_log(s, AV_LOG_ERROR,
 232                "Cannot allocate %"PRIu32" bytes of extradata\n",
 233                smk->treesize + 16);
 234         av_freep(&smk->frm_size);
 235         av_freep(&smk->frm_flags);
 236         return AVERROR(ENOMEM);
 237     }
 238     ret = avio_read(pb, st->codecpar->extradata + 16, st->codecpar->extradata_size - 16);
 239     if(ret != st->codecpar->extradata_size - 16){
 240         av_freep(&smk->frm_size);
 241         av_freep(&smk->frm_flags);
 242         return AVERROR(EIO);
 243     }
 244     ((int32_t*)st->codecpar->extradata)[0] = av_le2ne32(smk->mmap_size);
 245     ((int32_t*)st->codecpar->extradata)[1] = av_le2ne32(smk->mclr_size);
 246     ((int32_t*)st->codecpar->extradata)[2] = av_le2ne32(smk->full_size);
 247     ((int32_t*)st->codecpar->extradata)[3] = av_le2ne32(smk->type_size);
 248
 249     smk->curstream = -1;
 250     smk->nextpos = avio_tell(pb);
 251
 252     return 0;
 253 }
 254
 255
 256 static int smacker_read_packet(AVFormatContext *s, AVPacket *pkt)
 257 {
 258     SmackerContext *smk = s->priv_data;
 259     int flags;
 260     int ret;
 261     int i;
 262     int frame_size = 0;
 263     int palchange = 0;
 264
 265     if (avio_feof(s->pb) || smk->cur_frame >= smk->frames)
 266         return AVERROR_EOF;
 267
 268     /* if we demuxed all streams, pass another frame */
 269     if(smk->curstream < 0) {
 270         avio_seek(s->pb, smk->nextpos, 0);
 271         frame_size = smk->frm_size[smk->cur_frame] & (~3);
 272         flags = smk->frm_flags[smk->cur_frame];
 273         /* handle palette change event */
 274         if(flags & SMACKER_PAL){
 275             int size, sz, t, off, j, pos;
 276             uint8_t *pal = smk->pal;
 277             uint8_t oldpal[768];
 278
 279             memcpy(oldpal, pal, 768);
 280             size = avio_r8(s->pb);
 281             size = size * 4 - 1;
 282             if(size + 1 > frame_size)
 283                 return AVERROR_INVALIDDATA;
 284             frame_size -= size;
 285             frame_size--;
 286             sz = 0;
 287             pos = avio_tell(s->pb) + size;
 288             while(sz < 256){
 289                 t = avio_r8(s->pb);
 290                 if(t & 0x80){ /* skip palette entries */
 291                     sz += (t & 0x7F) + 1;
 292                     pal += ((t & 0x7F) + 1) * 3;
 293                 } else if(t & 0x40){ /* copy with offset */
 294                     off = avio_r8(s->pb);
 295                     j = (t & 0x3F) + 1;
 296                     if (off + j > 0x100) {
 297                         av_log(s, AV_LOG_ERROR,
 298                                "Invalid palette update, offset=%d length=%d extends beyond palette size\n",
 299                                off, j);
 300                         return AVERROR_INVALIDDATA;
 301                     }
 302                     off *= 3;
 303                     while(j-- && sz < 256) {
 304                         *pal++ = oldpal[off + 0];
 305                         *pal++ = oldpal[off + 1];
 306                         *pal++ = oldpal[off + 2];
 307                         sz++;
 308                         off += 3;
 309                     }
 310                 } else { /* new entries */
 311                     *pal++ = smk_pal[t];
 312                     *pal++ = smk_pal[avio_r8(s->pb) & 0x3F];
 313                     *pal++ = smk_pal[avio_r8(s->pb) & 0x3F];
 314                     sz++;
 315                 }
 316             }
 317             avio_seek(s->pb, pos, 0);
 318             palchange |= 1;
 319         }
 320         flags >>= 1;
 321         smk->curstream = -1;
 322         /* if audio chunks are present, put them to stack and retrieve later */
 323         for(i = 0; i < 7; i++) {
 324             if(flags & 1) {
 325                 uint32_t size;
 326                 int err;
 327
 328                 size = avio_rl32(s->pb) - 4;
 329                 if (!size || size + 4LL > frame_size) {
 330                     av_log(s, AV_LOG_ERROR, "Invalid audio part size\n");
 331                     return AVERROR_INVALIDDATA;
 332                 }
 333                 frame_size -= size;
 334                 frame_size -= 4;
 335                 smk->curstream++;
 336                 if ((err = av_reallocp(&smk->bufs[smk->curstream], size)) < 0) {
 337                     smk->buf_sizes[smk->curstream] = 0;
 338                     return err;
 339                 }
 340                 smk->buf_sizes[smk->curstream] = size;
 341                 ret = avio_read(s->pb, smk->bufs[smk->curstream], size);
 342                 if(ret != size)
 343                     return AVERROR(EIO);
 344                 smk->stream_id[smk->curstream] = smk->indexes[i];
 345             }
 346             flags >>= 1;
 347         }
 348         if (frame_size < 0 || frame_size >= INT_MAX/2)
 349             return AVERROR_INVALIDDATA;
 350         if (av_new_packet(pkt, frame_size + 769))
 351             return AVERROR(ENOMEM);
 352         if(smk->frm_size[smk->cur_frame] & 1)
 353             palchange |= 2;
 354         pkt->data[0] = palchange;
 355         memcpy(pkt->data + 1, smk->pal, 768);
 356         ret = avio_read(s->pb, pkt->data + 769, frame_size);
 357         if(ret != frame_size)
 358             return AVERROR(EIO);
 359         pkt->stream_index = smk->videoindex;
 360         pkt->pts          = smk->cur_frame;
 361         pkt->size = ret + 769;
 362         smk->cur_frame++;
 363         smk->nextpos = avio_tell(s->pb);
 364     } else {
 365         if (smk->stream_id[smk->curstream] < 0 || !smk->bufs[smk->curstream])
 366             return AVERROR_INVALIDDATA;
 367         if (av_new_packet(pkt, smk->buf_sizes[smk->curstream]))
 368             return AVERROR(ENOMEM);
 369         memcpy(pkt->data, smk->bufs[smk->curstream], smk->buf_sizes[smk->curstream]);
 370         pkt->size = smk->buf_sizes[smk->curstream];
 371         pkt->stream_index = smk->stream_id[smk->curstream];
 372         pkt->pts = smk->aud_pts[smk->curstream];
 373         smk->aud_pts[smk->curstream] += AV_RL32(pkt->data);
 374         smk->curstream--;
 375     }
 376
 377     return 0;
 378 }
 379
 380 static int smacker_read_close(AVFormatContext *s)
 381 {
 382     SmackerContext *smk = s->priv_data;
 383     int i;
 384
 385     for(i = 0; i < 7; i++)
 386         av_freep(&smk->bufs[i]);
 387     av_freep(&smk->frm_size);
 388     av_freep(&smk->frm_flags);
 389
 390     return 0;
 391 }
 392
 393 AVInputFormat ff_smacker_demuxer = {
 394     .name           = "smk",
 395     .long_name      = NULL_IF_CONFIG_SMALL("Smacker"),
 396     .priv_data_size = sizeof(SmackerContext),
 397     .read_probe     = smacker_probe,
 398     .read_header    = smacker_read_header,
 399     .read_packet    = smacker_read_packet,
 400     .read_close     = smacker_read_close,
 401 };